Question

请帮忙解决以下问题的方案

我们的对象结构如上所示。让一个支持Java Persistence的对象命名为＆＃39; User.java＆＃39;和User.java包含＆＃39; Us

的列表

＆＃13;

public class FXUserDAOImpl implements FXUserDAO {

  private TOVOConvertor<FXUserTO, FXUserVO> tovoConvertor =  null;
  private PersistenceManagerFactory pmf;

  public FXUserDAOImpl() {
		this.tovoConvertor = new FXUserVOTO();
		this.pmf = JDOHelper.getPersistenceManagerFactory("TALOS");
	}

	@Override
	public Object persist(FXUserTO to) {
		FXUserVO vo = tovoConvertor.convertTO(to);		
		PersistenceManager pm = pmf.getPersistenceManager();
		Transaction tx = pm.currentTransaction();
		Object id = null;
		try {
			tx.begin();
			FxUserManagementMonitor.monitor.debug("Persisting : " + vo);
	
			pm.makePersistent(vo);
			tx.commit();
			id = pm.getObjectId(vo);
			FxUserManagementMonitor.monitor.debug("Persisted Object Id : " + id);
		} catch (Exception e) {
			FxUserManagementMonitor.monitor.error("Exception persisting data : " , e);
			throw new DataManagementRuntimeException(PlatformExceptionEnum.QUERY_SQL_EXCPETION,"Failed to execute persist ",e);
		} finally {
			if (tx.isActive()) {
				tx.rollback();
			}
			pm.close();
		}
		FxUserManagementMonitor.monitor.debug("Persisted Successfully "+id);
		return id;		
	}

	@Override
	public List<FXUserTO> retrieveAll() {

        PersistenceManager persistentManager;
		Transaction transaction;
		List<FXUserTO> toList = new ArrayList<>();		
		persistentManager = pmf.getPersistenceManager();
		transaction = persistentManager.currentTransaction();
		try {
			transaction.begin();
			FxUserManagementMonitor.monitor.debug("Retrieving Extent...");
			
			Extent<FXUserVO> voExtend = persistentManager.getExtent(FXUserVO.class, true);
			Iterator<FXUserVO> iterator = voExtend.iterator();
			iterator.forEachRemaining(eachVo -> {toList.add(tovoConvertor.convertVO(eachVo));});
			transaction.commit();
		} catch (Exception e) {
			FxUserManagementMonitor.monitor.error("Failed to retrieve all ...",e);
	
			throw new DataManagementRuntimeException(PlatformExceptionEnum.QUERY_SQL_EXCPETION,"Failed to execute retrieveAll ",e);

		} finally {
			if (transaction.isActive()) {
				transaction.rollback();
			}
			persistentManager.close();
		}
		FxUserManagementMonitor.monitor.debug("Successfully retrieved all ...");
	

		return toList;

	}

}

＆＃13;

＆＃39;群组＆＃39 ;.我们还有两个DAO类来持久化和检索User和UserGroups。

首先我们使用UserGroups DAO，Say Group_1，Group_2和Group_3
第二个我们插入包含UserGroup Group_1，Group_2的用户。

我们期望的是，所有用户信息都将保存到用户表，并且只链接到Group_1，Group_2将保留在该表中。但是我们正在获得INVALID SQL Query Exception。如下。实际上它试图将新记录输入UserGroup表

＆＃13;

@PersistenceCapable(identityType=IdentityType.APPLICATION,table="FXUserVO")
public class FXUserVO   implements TalosVO {

   @PrimaryKey
   @Column(name ="userId",jdbcType = "VARCHAR")
   @Persistent
   private String userId;
    
   @Element(column="userId")
   @ForeignKey(name="FK_GROUPS_FXUSERVO")
   @Persistent
   private List<UserGroupVO> groups;
   
   ------  
}


@PersistenceCapable(identityType=IdentityType.APPLICATION,table="UserGroupVO")
public class UserGroupVO   implements TalosVO {

   @PrimaryKey
   @Column(name ="groupId",jdbcType = "VARCHAR")
   @Persistent
   private String groupId;
    
   @Column(name ="groupName",jdbcType = "VARCHAR")
   @Persistent
   private String groupName;
    


}

＆＃13;

线程中的异常＆＃34; main＆＃34; com.evermore.talos.platform.datamanagement.api.exception.DataManagementRuntimeException：SQL QUERY无效＆gt;无法执行持久化 at com.evermore.talos.services.fxservices.fxusermanagementapi.generated.dao.FXUserDAOImpl.persist（FXUserDAOImpl.java:52） at com.evermore.talos.services.fxservices.fxusermanagementapi.generated.dao.FXUserDAOImpl.persist（FXUserDAOImpl.java:1） at com.evermore.talos.services.fxservices.fxusermanagementapi.generation.FXUserDAOImplTest.testFXuser（FXUserDAOImplTest.java:56） at com.evermore.talos.services.fxservices.fxusermanagementapi.generation.FXUserDAOImplTest.main（FXUserDAOImplTest.java:35）引起：javax.jdo.JDODataStoreException：插入对象＆＃34; com.evermore.talos.services.fxservices.fxusermanagementapi.generated.vo.UserGroupVO@23c30a20"使用声明＆＃34; INSERT INTO USERGROUPVO（GROUPNAME，GROUPID，USERID，GROUPS_INTEGER_IDX）VALUES（？，？，？，？）＆＃ 34;失败：重复录入＆＃39;群组1＆＃39;关键＆＃39; PRIMARY＆＃39; NestedThrowables： com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException：重复条目＆＃39; Group1＆＃39;关键＆＃39; PRIMARY＆＃39; at org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException（NucleusJDOHelper.java:543）在org.datanucleus.api.jdo.JDOPersistenceManager.jdoMakePersistent（JDOPersistenceManager.java:717） at org.datanucleus.api.jdo.JDOPersistenceManager.makePersistent（JDOPersistenceManager.java:738） at com.evermore.talos.services.fxservices.fxusermanagementapi.generated.dao.FXUserDAOImpl.persist（FXUserDAOImpl.java:46） ......还有3个引起：com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException：重复条目＆＃39; Group1＆＃39;关键＆＃39; PRIMARY＆＃39; at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method） at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62） at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45） at java.lang.reflect.Constructor.newInstance（Constructor.java:423）在com.mysql.jdbc.Util.handleNewInstance（Util.java:425）在com.mysql.jdbc.Util.getInstance（Util.java:408）在com.mysql.jdbc.SQLError.createSQLException（SQLError.java:935）在com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:3970）在com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:3906）在com.mysql.jdbc.MysqlIO.sendCommand（MysqlIO.java:2524）在com.mysql.jdbc.MysqlIO.sqlQueryDirect（MysqlIO.java:2677）在com.mysql.jdbc.ConnectionImpl.execSQL（ConnectionImpl.java:2549）在com.mysql.jdbc.PreparedStatement.executeInternal（PreparedStatement.java:1861）在com.mysql.jdbc.PreparedStatement.executeUpdateInternal（PreparedStatement.java:2073） at com.mysql.jdbc.PreparedStatement.executeUpdateInternal（PreparedStatement.java:2009）在com.mysql.jdbc.PreparedStatement.executeLargeUpdate（PreparedStatement.java:5098）在com.mysql.jdbc.PreparedStatement.executeUpdate（PreparedStatement.java:1994） at org.datanucleus.store.rdbms.datasource.dbcp2.DelegatingPreparedStatement.executeUpdate（DelegatingPreparedStatement.java:98） at org.datanucleus.store.rdbms.datasource.dbcp2.DelegatingPreparedStatement.executeUpdate（DelegatingPreparedStatement.java:98） at org.datanucleus.store.rdbms.ParamLoggingPreparedStatement.executeUpdate（ParamLoggingPreparedStatement.java:393） at org.datanucleus.store.rdbms.SQLController.executeStatementUpdate（SQLController.java:432）在org.datanucleus.store.rdbms.request.InsertRequest.execute（InsertRequest.java:398）在org.datanucleus.store.rdbms.RDBMSPersistenceHandler.insertObjectInTable（RDBMSPersistenceHandler.java:162）在org.datanucleus.store.rdbms.RDBMSPersistenceHandler.insertObject（RDBMSPersistenceHandler.java:138） at org.datanucleus.state.StateManagerImpl.internalMakePersistent（StateManagerImpl.java:3369） at org.datanucleus.state.StateManagerImpl.makePersistent（StateManagerImpl.java:3345） at org.datanucleus.ExecutionContextImpl.persistObjectInternal（ExecutionContextImpl.java:1987） at org.datanucleus.ExecutionContextImpl.persistObjectInternal（ExecutionContextImpl.java:2084） at org.datanucleus.store.types.SCOUtils.validateObjectForWriting（SCOUtils.java:1445） at org.datanucleus.store.rdbms.scostore.ElementContainerStore.validateElementForWriting（ElementContainerStore.java:289） at org.datanucleus.store.rdbms.scostore.FKListStore.validateElementForWriting（FKListStore.java:928）在org.datanucleus.store.rdbms.scostore.FKListStore.internalAdd（FKListStore.java:534） at org.datanucleus.store.rdbms.scostore.AbstractListStore.addAll（AbstractListStore.java:137） at org.datanucleus.store.rdbms.mapping.java.CollectionMapping.postInsert（CollectionMapping.java:157）在org.datanucleus.store.rdbms.request.InsertRequest.execute（InsertRequest.java:507）在org.datanucleus.store.rdbms.RDBMSPersistenceHandler.insertObjectInTable（RDBMSPersistenceHandler.java:162）在org.datanucleus.store.rdbms.RDBMSPersistenceHandler.insertObject（RDBMSPersistenceHandler.java:138） at org.datanucleus.state.StateManagerImpl.internalMakePersistent（StateManagerImpl.java:3369） at org.datanucleus.state.StateManagerImpl.makePersistent（StateManagerImpl.java:3345） at org.datanucleus.ExecutionContextImpl.persistObjectInternal（ExecutionContextImpl.java:1987） at org.datanucleus.ExecutionContextImpl.persistObjectWork（ExecutionContextImpl.java:1830） at org.datanucleus.ExecutionContextImpl.persistObject（ExecutionContextImpl.java:1685） at org.datanucleus.api.jdo.JDOPersistenceManager.jdoMakePersistent（JDOPersistenceManager.java:712） ......还有5个

如何处理DataNucleus中的1-N关系？

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